:root {
  color-scheme: light dark;
  /* Tokens below are the app's own, from DESIGN.md "Color and type".
     Night Stage #080A0F, Cloud #F4F1EA, Dawn Spark #FF6846, Open Sky #58C7F3.
     The settled shell is true white with dark ink in Light Mode and Night Stage
     with Cloud ink in Dark Mode — never the former cream paper. */
  --night-stage: #080A0F;
  --cloud: #F4F1EA;
  --dawn-spark: #FF6846;
  --open-sky: #58C7F3;

  --bg: #FFFFFF;
  --ink: #17181B;
  --muted: #6A6E76;
  --line: #E4E7EB;
  --card: #FFFFFF;
  /* Dawn Spark is only 2.87:1 on white, so small accent text uses a darkened
     Dawn at 4.51:1 while surfaces keep the true accent. */
  --dawn-surface: var(--dawn-spark);
  --dawn-text: #C75137;
  --focus: #359EC7;
  --accent-ink: #17181B;
  --shadow: 0 20px 40px -24px rgba(8, 10, 15, 0.25);
  --bezel-1: #2C2C2E;
  --bezel-2: #151517;
  --radius-action: 18px;
  --radius-surface: 22px;
  --radius-tile: 4px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #080A0F;
    --ink: #F4F1EA;
    --muted: #9AA0A8;
    --line: #23262E;
    --card: #12151C;
    /* On Night Stage the true Dawn Spark already clears AA at 6.9:1. */
    --dawn-text: #FF6846;
    --focus: #58C7F3;
    --shadow: 0 20px 40px -24px rgba(0, 0, 0, 0.55);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
main { max-width: 640px; margin: 0 auto; padding: 0 24px; }
section { padding: 56px 0; }
h1, h2 {
  font-family: ui-rounded, "SF Pro Rounded", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.15;
  margin: 0 0 12px;
}
h3 { font-family: ui-rounded, "SF Pro Rounded", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; margin: 0 0 8px; }
p { margin: 0 0 12px; }
a { color: inherit; text-decoration-color: var(--muted); }
img { max-width: 100%; display: block; }
ol { list-style: none; margin: 0; padding: 0; }

.eyebrow {
  display: block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--dawn-text);
  margin-bottom: 10px;
}
.section-head { text-align: center; max-width: 480px; margin: 0 auto 36px; }
.section-head h2 { font-size: 1.7rem; }

/* ---------- header ---------- */
header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 640px;
  margin: 0 auto;
  padding: 18px 24px;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand img { width: 28px; height: 28px; border-radius: 8px; }
.brand span {
  font-family: ui-rounded, "SF Pro Rounded", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 12px;
  white-space: nowrap;
}
.badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--dawn-text);
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 0.4; transform: scale(0.85); }
  50% { opacity: 1; transform: scale(1); }
}

/* ---------- hero ---------- */
.hero { padding-top: 32px; text-align: center; }
.hero-copy h1 {
  font-size: clamp(2rem, 7vw, 2.7rem);
  letter-spacing: -0.01em;
}
.hero-copy .lede {
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 480px;
  margin: 0 auto 28px;
}

.download-cta {
  display: inline-block;
  font-size: 1rem;
  font-weight: 600;
  padding: 14px 28px;
  border-radius: var(--radius-action);
  color: var(--accent-ink);
  background: var(--dawn-surface);
  text-decoration: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.download-cta:hover { transform: translateY(-1px); box-shadow: var(--shadow); }
.download-cta:active { transform: translateY(0); }

.invite-actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}
.store-link {
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 600;
  text-underline-offset: 3px;
}

.form-note { font-size: 0.82rem; color: var(--muted); margin-top: 10px; }

/* ---------- device frame (native app screenshot mockup) ---------- */
.phone-frame {
  position: relative;
  border-radius: 40px;
  padding: 12px;
  background: linear-gradient(160deg, var(--bezel-1), var(--bezel-2));
  box-shadow: var(--shadow), inset 0 0 0 1px rgba(255, 255, 255, 0.08);
}
.phone-frame img { border-radius: 28px; width: 100%; height: auto; }


/* ---------- grid mosaic (decorative) ---------- */
.mosaic-wrap { display: flex; justify-content: center; padding: 40px 0 8px; }
.mosaic {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  gap: 2px;
  width: min(100%, 340px);
}
.mosaic i {
  display: block;
  aspect-ratio: 1;
  border-radius: var(--radius-tile);
  background: var(--tile, #3372B9);
  opacity: 0;
  animation: tile-land 420ms ease-out forwards;
  animation-delay: var(--delay, 0s);
}
@keyframes tile-land {
  from { opacity: 0; transform: scale(0.82); }
  to   { opacity: 1; transform: scale(1); }
}
@media (prefers-reduced-motion: reduce) {
  .mosaic i { animation: none; opacity: 1; transform: none; }
  .badge .dot { animation: none; }
}

.divider { border: none; border-top: 1px solid var(--line); margin: 0; }

/* ---------- how it works ---------- */
.how-it-works { padding: 56px 0; }
.steps { display: flex; flex-direction: column; gap: 44px; }
.step { text-align: center; }
.step .phone-frame--step { max-width: 220px; margin: 0 auto 20px; }
.step-number {
  display: block;
  font-family: ui-rounded, "SF Pro Rounded", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.85rem;
  color: var(--dawn-text);
  letter-spacing: 0.06em;
  margin-bottom: 6px;
}
.step-copy h3 { font-size: 1.25rem; }
.step-copy p { color: var(--muted); max-width: 40ch; margin: 0 auto; }

/* ---------- FAQ ---------- */
.faq-list { display: flex; flex-direction: column; gap: 0; border-top: 1px solid var(--line); }
.faq-item {
  border-bottom: 1px solid var(--line);
  padding: 4px 2px;
}
.faq-item summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 0;
  font-weight: 600;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item .chev { width: 18px; height: 18px; flex-shrink: 0; color: var(--muted); transition: transform 0.2s ease; }
.faq-item[open] .chev { transform: rotate(180deg); }
.faq-item p { color: var(--muted); padding-bottom: 18px; margin: 0; }

/* ---------- secondary CTA ---------- */
.cta-again { text-align: center; }
.cta-again h2 { font-size: 1.6rem; }
.cta-again .lede { color: var(--muted); max-width: 420px; margin: 0 auto 24px; }

/* ---------- footer ---------- */
footer {
  max-width: 640px;
  margin: 0 auto;
  padding: 40px 24px 64px;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 32px;
  font-size: 0.85rem;
  color: var(--muted);
}
.footer-brand { max-width: 260px; }
.footer-brand .brand { margin-bottom: 8px; }
.footer-links { display: flex; gap: 48px; }
.footer-col { display: flex; flex-direction: column; gap: 10px; }
.footer-col h3 {
  font-family: inherit;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink);
  margin: 0 0 2px;
}
.footer-col a { color: var(--muted); text-decoration: none; }
.footer-col a:hover { color: var(--ink); }
footer button.share {
  font: inherit;
  color: var(--muted);
  background: none;
  border: none;
  padding: 0;
  text-align: left;
  cursor: pointer;
}
footer button.share:hover { color: var(--ink); }
.copyright { width: 100%; margin: 0; padding-top: 16px; border-top: 1px solid var(--line); font-size: 0.78rem; }

/* ---------- desktop enhancement ---------- */
@media (min-width: 860px) {
  main { max-width: 1040px; }
  header { max-width: 1040px; }
  footer { max-width: 1040px; }

  .hero { padding-top: 72px; }
  .hero-copy { max-width: 640px; margin: 0 auto; }

  .mosaic-wrap { padding: 56px 0 8px; }

  .how-it-works .section-head,
  .faq .section-head,
  .faq-list,
  .cta-again {
    max-width: 640px;
    margin-left: auto;
    margin-right: auto;
  }

  .steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 36px; }
  .step { text-align: left; }
  .step .phone-frame--step { margin: 0 0 20px; }
  .step-copy p { margin: 0; }
}

@media (max-width: 360px) { header { padding-inline: 16px; gap: 8px; } .badge { font-size: 0.68rem; padding: 6px 8px; } }